package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        // 判断当前菜品或套餐是否在购物车中
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        // 如果已经存在，数量加1
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //不存在，添加到购物车中
            //判断当前添加到购物车中的商品为套餐还是菜品
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId!= null) {
                // 当前添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                // 当前添加到购物车的是套餐
                Long setmealId = shoppingCart.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();// 获取当前用户id
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
       List<ShoppingCart> list= shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /*
    * 清空购物车
    * */
    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //获取要删除购物车的用户id和要删除的菜品/套餐id
        Long userId = BaseContext.getCurrentId();
        //进行拷贝
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(userId);
        //查询当前用户购物车中菜品/套餐的数量，若有复数分直接将其-1即可
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            Integer number = cart.getNumber();
            if (number == 1) {
                //若为1，则直接删除
                shoppingCartMapper.deleteById(cart.getId());
            }else {
                //若大于1，则直接-1
                cart.setNumber(cart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(cart);
           }
        }

    }
}
